Overview
The NCP1203D100R2G, produced by onsemi, is a PWM Current-Mode Controller designed for universal off-line power supplies. It is housed in an SOIC-8 package and is a significant advancement in ultra-compact switch-mode power supplies. This controller is an excellent replacement for UC384X devices, leveraging onsemi's proprietary SMARTMOS Very High Voltage Technology. It enables the implementation of complete off-line AC/DC adapters, battery chargers, and high-power SMPS with minimal external components. The NCP1203 features a high-voltage startup FET, ensuring a clean and loss-less startup sequence, and operates at fixed switching frequencies of 40 kHz, 60 kHz, or 100 kHz.
Key Specifications
| Characteristic | Symbol | Pin | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Turn-on Threshold Level, VCC Going Up | VCC(on) | 6 | 12.2 | 12.8 | 14 | V |
| Minimum Operating Voltage after Turn-on | VCC(min) | 6 | 7.2 | 7.8 | 8.4 | V |
| Internal IC Consumption, No Output Load on Pin 5 | ICC1 | 6 | - | 750 | 880 | μA |
| Internal IC Consumption, 1.0 nF Output Load on Pin 5, FSW = 100 kHz | ICC2 | 6 | - | 1.2 | 1.4 | mA |
| Oscillation Frequency, 100 kHz Version | fOSC | - | 90 | 103 | 115 | kHz |
| Maximum Duty-Cycle | Dmax | - | 74 | 80 | 87 | % |
| Maximum Junction Temperature | TJMAX | - | - | 150 | °C | |
| Temperature Shutdown | - | - | - | 170 | °C |
Key Features
- High-Voltage Startup Current Source
- Auto-Recovery Internal Output Short-Circuit Protection
- Extremely Low No-Load Standby Power
- Current-Mode with Adjustable Skip-Cycle Capability
- Internal Leading Edge Blanking
- 250 mA Peak Current Capability
- Internally Fixed Frequency at 40 kHz, 60 kHz, and 100 kHz
- Direct Optocoupler Connection
- Undervoltage Lockout at 7.8 V Typical
- SPICE Models Available for Transient and AC Analysis
- Pin to Pin Compatible with NCP1200
- Pb-Free, Halogen Free/BFR Free and RoHS Compliant
Applications
- AC-DC Adapters for Notebooks, etc.
- Offline Battery Chargers
- Auxiliary Power Supplies (USB, Appliances, TVs, etc.)
Q & A
- What is the NCP1203D100R2G used for?
The NCP1203D100R2G is used for universal off-line power supplies, including AC-DC adapters, battery chargers, and high-power SMPS.
- What are the available switching frequencies for the NCP1203?
The NCP1203 operates at fixed switching frequencies of 40 kHz, 60 kHz, or 100 kHz.
- What is the purpose of the high-voltage startup FET in the NCP1203?
The high-voltage startup FET ensures a clean and loss-less startup sequence.
- How does the NCP1203 manage overcurrent protection?
The NCP1203 features an auto-recovery output short-circuit protection that stops switching pulses and reduces consumption when an overload condition is detected.
- What is the significance of the skip cycle feature in the NCP1203?
The skip cycle feature allows the device to skip unwanted switching cycles at low power levels, reducing standby power and ensuring noise-free operation.
- What is the maximum junction temperature for the NCP1203?
The maximum junction temperature for the NCP1203 is 150°C.
- Is the NCP1203 RoHS compliant?
Yes, the NCP1203 is Pb-Free, Halogen Free/BFR Free and RoHS Compliant.
- What is the typical undervoltage lockout level for the NCP1203?
The typical undervoltage lockout level for the NCP1203 is 7.8 V.
- How does the NCP1203 handle temperature shutdown?
The NCP1203 features a temperature shutdown with hysteresis, shutting down at 170°C and restarting after a 30°C hysteresis.
- What are the package options for the NCP1203?
The NCP1203 is available in SOIC-8 and PDIP-8 packages.
